Space.comScience & Astronomy Asteroid Basics: A Space Rock Quiz By SPACE.com Staff | April 24, 2012 09:00am ET MORE Asteroids are fascinating for lots of reasons. They contain a variety of valuable resources and slam into our planet on a regular basis, occasionally snuffing out most of Earth's lifeforms. How much do you know about space rocks? Start the Quiz 0 of Start Over More from Space.com This New NASA Photo of Saturn and Its Rings Is Simply Jaw-Dropping Latest Saturn Photos From NASA's Cassini Orbiter World's Largest Telescope Now Has a Construction Contract Extremely Large Telescope Could Unlock Secrets Of Alien Planets - How It Works | Video 'Magic Islands' May Bubble to the Surface of Saturn's Moon Titan Image of the Day Mystery Solved? Supermassive Black Holes Likely Born Big Mystery Plumes: Did the Sun Bruise Mars?